I suspect that under the correct conditions, even a Crealock will surf. I sailed trans-Atlantic on a 100 foot schooner and I was at the helm when we surfed down some massive mid-Atlantic swells. It can be done on a full displacement hull.
Well there's surfing and then there's surfing. I've had my PSC44 up beyond 13 kts when we had a spinnaker up with good wind and big swells. That's way beyond what would be considered hull-speed, and we were pushing aside a whole lot of water.
But, we were on the hairy edge of control. The force required to get us up to that speed was incredible, and we were far from stable. With the slightest mistake in steering we would have rounded up or down and ended up on our side. Which has happened a few times and I've got the splintered spinnaker poles to show for it. This is why I actually prefer cruising to racing.
A boat that *wants* to surf will remain under easy control and the loads remain manageable as the speed goes up. My boat is not one of these. But my boat feels great in tough conditions, nothing creaks and the doors still open easily when we are hard-pressed.
This reminds me of another reason I love my boat. The bridge-deck is as high as the cockpit coaming. While this means we have to climb up and down to get below, it also means that the cabin stays dry. We've been pinned down after a round-down, with water over the coaming and the cockpit awash (cushions floating away, etc.), the portlights showing green water and fish, and even with the washboards stowed and the hatch open the cabin remained dry. On some other boats there would have been serious downflooding.
In 2014 we were sailing south from Washington to San Francisco, getting ready for the 2014 Pacific Cup. Around Cape Blanco (near the OR/CA border) we found ourselves in 45 kt winds with over 60 Kt gusts, and probably 15-20ft waves. True, it took some effort on the helm, but the boat took care of us in some pretty awful conditions. My crew, who have mostly sailed on more lightly-built and "racier" boats were quite impressed with how the PSC was handling things. Here's a link with some pictures: The Friday Harbor to San Francisco Delivery in Pictures « VALIS